Question: What are the system of units which start with the letter u
Paraphrase: What are the framework of units which begin with the letter u
SPARQL (Wikidata): SELECT DISTINCT ?sbj ?sbj_label WHERE { ?sbj wdt:P31 wd:Q932268 . ?sbj rdfs:label ?sbj_label . FILTER(STRSTARTS(lcase(?sbj_label), 'u')) . FILTER (lang(?sbj_label) = 'en') } LIMIT 25 
Answer: United States customary system, United States customary system